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#11
04-03-2016, 05:29 PM
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You could ohm out the heaters... if they are already open they have likely burned out because the tube has gone gassy. Game over.
If they are not open, you could apply 6.3 volts and see if they light up normal brilliance ... if they do, the tube could be good, further testing is necessary. If they only glow dim and the neck quickly gets hot the tube is likely gassy... a few minutes of this and they likely will blow out. Been there, seen that  Regardless, that is a heckofa good score, congratulations!  jr Last edited by jr_tech; 04-03-2016 at 05:48 PM. 
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